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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>格式文本</title>
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<body>
<!-- 
    b i s u 
    sup sub
    big small
    code samp var dfn
    abbr


    div span 无语义的容器
    div 块容器
    span 文字容器
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    <p><i>你好</i><b>你好</b><s>你好</s><u>你好</u></p>
    <p>x<sup>2</sup> x<sub>2</sub> </p>
    <p><big>大字</big><small>小字</small></p>
    <p>超文本标记语言<abbr title="Hyper Text Markup Language">HTML</abbr></p>
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